JPH04124165U - medical catheter - Google Patents

Abstract

(57) [Summary] [Purpose] This product is designed to prevent the reinforcing wire from popping out, which was a problem with catheters for injecting cardioplegia fluid used during open heart surgery using extracorporeal circulation, and is highly safe.
The present invention also provides a catheter with excellent operability. [Structure] A conical or spindle-shaped sponge or balloon is attached to the tip of a tube (1) with a wire (3) embedded in the tube wall, and a fluid is inserted into the main lumen (6) of the tube at the end. At the same time, the end of the wire (3) can be taken out from the tube wall of the tube and fixed by wrapping around the outer circumference of the tube, or covered with a protective tube and inserted into the tube wall. It is characterized by being embedded.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is mainly used for injecting medical solutions into internal lumens, such as coronary arteries. The present invention relates to a medical catheter.

0002

[Conventional technology]

Conventionally, when performing open heart surgery using extracorporeal circulation, cardioplegia fluid has been applied to prevent myocardial necrosis. A method of injecting into the coronary artery, ie, coronary perfusion, has become one of the essential procedures.

0003 Cannulae for coronary perfusion generally have a metal pipe with a metal pipe at the tip. Many are equipped with a plastic tip or a resin basket. death However, this method requires the surgeon to hold the cardioplegia in place while injecting the cardioplegia fluid. In addition, the burden on the surgeon cannot be ignored during long surgeries.

0004 A soft tip with a balloon at the tip is a cannula that does not require such retention. A tube has been devised. Compared to conventional rigid cannulas, this Although this product is excellent in terms of fixation with the tube and prevention of liquid leakage, it has this drawback. This makes the balloon slippery, especially in mucous membranes such as inside blood vessels. In addition, the tube can easily slip out due to the pressure when injecting cardioplegia fluid. There were many ru.

[0005] On the other hand, instead of this conventional type, a circular A cannula equipped with a conical sponge is known. This is tube (1) A sponge (2) is glued to the tip and twisted into a rope shape along the outside of the tube. The wire (3) is attached, and the sponge (2) prevents it from coming off. That's a big improvement. However, this type of cannula In this case, the wire (3) is attached to the outside of the tube (1), so it cannot be used. When using the wire (3), there is a high risk of damaging the inner wall of the blood vessel, and the wire (3) is bent at a delicate angle. There were disadvantages such as difficulty in developing a habit of hair loss.

[0006] In order to solve this drawback, the inventors of the present invention have designed a tube (1) as shown in FIG. A tube with a wire (3) embedded in the tube wall was devised, and Utility Application No. 1-147734 was issued. was disclosed. In this design, there is no wire on the outside of the tube, so The risk of directly damaging the inner wall of blood vessels is greatly reduced, and at the same time, ease of use during use is greatly improved. Much improved.

[0007] However, if the tube is thin-walled, especially around the embedded wire, If the tube wall thickness is thin or if a flexible tube such as silicone rubber is used. Depending on how it is used, the tip of the wire may pierce the wall of the tube and cause damage to the blood vessel. There was a problem with the wall being damaged.

[0008]

[Problem that the idea aims to solve]

This invention solves the problem of conventional cannulas for injecting cardioplegia fluid, etc. This was done after various studies to prevent the embedded wire from popping out. This eliminates the risk of the ear protruding from the outside of the tube, ensuring high safety and ease of operation. The purpose is to provide superior medical catheters.

[0009]

[Means to solve the problem]

This invention uses a conical or spindle at the tip of a tube with a wire embedded in the tube wall. A shaped sponge or balloon is attached to the distal end to direct fluid into the main lumen of the tube. A tube provided with a connecting means for introducing the wire, the end of the wire comprising: It is led out from the tube wall and fixed around the outer circumference of the tube, or A medical catheter characterized in that it is covered with a protective tube and embedded in the tube wall. It's tell.

0010 Hereinafter, the medical catheter of the present invention will be explained in more detail with reference to the drawings.

[0011] FIG. 1 is a diagram showing the structure of a medical catheter that is an embodiment of the present invention. blood A wire (3) is embedded in the tube wall of the tube (1), and a sponge (2) is attached to the tip of the wire (3). is attached, and a connector (4) is provided at the rear end. The tube (1) is The outer diameter is usually around 3 mm, and the main lumen (6), which serves as a passage for the drug solution, and a wire are embedded. The material is silicone rubber or polyurethane. The material must be relatively flexible, including, but not limited to, plastic resin, etc. is desirable for operation. There is a wire protruding from the tube at the tip of wire (3). A protective tube (5) is covered and embedded in the tube wall to prevent (3) Place the rear end outside the tube wall and wrap it around the outer circumference of the tube (1) about once. It is fixed.

0012 The method of embedding the wire (3) in the wall of the tube (1) is to push the tube. During molding, a sub lumen (7) is created in addition to the main lumen (6) of the tube, and the sub lumen This is done by embedding the wire (3) inside. Another method is when extruding tubes. It is also possible to coextrude the wire (3). However, in the latter method , the former method is more preferable because processing becomes difficult.

[0013] The wire used is usually soft stainless steel wire, with a wire diameter of 0.2 mm to 1 m. A range of m is desirable for operation, but is not limited to this range. If so, it can be used.

[0014] Figure 2 is a diagram showing the method of processing the end of the wire (3) in the present invention, (a) indicates the basic processing method. Connect one end of the wire (3) to the outer circumference of the tube wall. Take it out and wrap it around the outer circumference of the tube approximately once. If adequate fixation can be obtained, half There's nothing wrong with it, even if it's only around 30 minutes. If one turn is not enough, you need to wrap it one more time or more. There is. Next, apply an appropriate adhesive to secure the wire around the tube. Apply. If necessary, it is also effective to cover this with a protective tube. It is.

[0015] Figure 3 shows one method of adhesively fixing the end of the wire (3) wrapped around the tube. In the figure showing an example, the adhesive (8) is applied to the outer peripheral fixing part of the wire and bonded, and then The state in which a covering tube (9) is further attached is shown. Using these methods More secure wire fixation can be obtained.

[0016] In Figure 2(a), the other end of the tube is covered with a protective tube (5). (1) is embedded in the tube wall. Applying these two types of wire processing methods By doing so, various methods such as those shown in FIGS. 2(b), (c), and (d) are implemented. be able to. In (b), both ends of wire (3) are rolled up and wrapped around the tube. The fixing method (c) is to attach protective tubes (5) to both ends of the tube. (d) is a method in which the entire wire is covered with a protective tube.

[0017] The material of the protective tube (5) used here is fluororesin, nylon. resins, polyester resins, polyvinyl chloride resins, etc. Not limited to these. Additionally, use resin heat shrink tubing like the one above. This further improves the ease of insertion into the tube (1).

[0018] The sponge (2) used in this invention is mainly made of polyurethane foam. However, it is not limited to this, as long as it has flexibility such as silicone foam material. good. In addition, conical and spindle shapes are suitable for the shape, but there are other shapes as well. For example, a combination of a conical shape and a cylindrical shape as shown in FIG. 4 is also possible.

[0019] FIG. 5 shows an expandable and deflated valve made of a rubber elastic body, which is another embodiment of the present invention. A medical device equipped with a balloon or a balloon (10) pre-shaped into a predetermined shape. It's a catheter. In this case, the lumens of the catheter include the main lumen (6) and In addition to the sublumen (7) for implanting the wire, a balloon airway (11) is added to the base. Essentially structured. Also, it is different from the main lumen in order to inject the drug solution as needed. It is also possible to provide multiple lumens. Applying the method shown in Figures 1 and 2 By using this method, wires can be safely embedded even in types with balloons attached. This greatly improves the operability of the catheter.

[0020]

[Effect of the idea]

By using the medical catheter of this invention, open heart surgery using extracorporeal circulation is possible. The tip of the tube can be easily bent or curved depending on the situation. It has excellent operability, and the injection of cardioplegia fluid into the coronary arteries is simpler and easier. The wire is embedded in the wall of the tube and its ends are fully covered. Therefore, there are no accidents caused by the wire protruding during use, thus damaging the blood vessel wall. It is extremely useful as it can be used safely and reduces the burden on the surgeon. It is.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of a medical catheter that is an embodiment of the present invention.

FIG. 2 is a diagram showing a wire processing method according to the present invention.

FIG. 3 is a schematic diagram showing an example of a method for fixing the wire end portion of FIG. 1;

FIG. 4 is a diagram showing another embodiment of the shape of the sponge at the tip of the tube according to the present invention.

FIG. 5 is a diagram showing the structure of a balloon-mounted medical catheter according to another embodiment of the present invention.

FIG. 6 is a diagram showing the structure of a conventional medical catheter.

FIG. 7 is a diagram showing the structure of a conventional medical catheter.

Claims (1)

[Scope of utility model registration request] Claim 1: A conical or spindle-shaped sponge or balloon is attached to the distal end of a tube with a wire embedded in the tube wall, and a connecting means for introducing fluid into the main lumen of the tube is provided at the distal end. The wire is arranged in a tube, and the end of the wire is led out from the tube wall and fixed around the outer periphery of the tube, or is covered with a protective tube and embedded in the tube wall. A medical catheter characterized by: